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(No Model.) 2 Sheets-Sheet 1.

J. P. PHASE. HOT AIR FURNACE.

No. 350,601. v Patented- Oct. 12, 1886.

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(No Model.) 2 Sheets-Sheet 2.

J. F. PEASE.

HOT-AIRPU-RNAGE.

No. 350,601. Patented Oct. 12, 1886.

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UNITED STATES PATENT OFE cEt J OHN-F. PEASE, OF SYRACUSE, NEYV YORK.

l-lOT-AIR FURNACE.

SPECIFICATION forming part of Letters Patent No. 350,601, dated October 12, 1886.

Application filed November 16, 1585. Serial No. 182,917. (No model.)

To all whom it may concern:

Be it known that I, JOHN F. PEASE, of Syracuse, in the county of Onondaga, in the State of New York, have invented new and useful Improvements in Hot-Air Furnaces, of which the following, taken in connection with the ac companying drawing is a full, clear, and exact description.

This invention relates to-the class of hot-air furnaces'which have around the exterior of the combustion-chamber tortuous fire-flues,constituting heatradiators, which increase the heating capacity of the furnace; and theiuvention consists in an improved construction and combination of the aforesaid radiators and their connections with each other and with the combustion-chamber, all as hereinafter more fully described, and specifically set forth in the claims.

In the annexed drawings, Figure I is a side elevation of the furnace with the inclosingcasing shown in section. transverse section of the same; and Figs. III and IV are horizontal sections taken, respectively, on lines 00 a: and y y, Fig. I.

Similar letters of reference indicate corresponding parts.

A represents the ash box or pit, upon which is mounted the fire-pot B, and upon the latter is seated the combustion-cham her 0, in the usual manner. The combustion-chamber is provided with the feed-door E, through which to introduce the fuel.

D denotes the usual casing, which incloses the furnace, and may consist either of masonry or of metal, as shown. The air to be heated is admitted to the interior of the casing D at the base thereof, and from thence it rises and circulates around the fire-pot and combustionchamber and passes out through the hot-air pipes H H, which are extended from the top of the casing to the apartments to be heated.

In order to augment the heating capacity of the furnace, the heating-surface thereof has been increased by radiators of various descriptions connected with the vfurnace in such a manner as to receive through them the pro ducts of combusti on,'and the efficiency of such radiators depends chiefly on their construction. To this important feature my present invention is directed. I form two radiators of pipes, pp, arranged horizontally one above the other,

Fig. II is a vertical and extended in the form of segments around the exterior of the combustion-chamber, with I per pipe or radiator, P, is extended around the front portion of the combustion-chamber G and terminates at the rear portion of the same, and communicates thereat with the up per part of the combustion-chamber by pipes a (1, extending from the ends of the radiator to the said part of the combustion-chamber, as shown in Fig. I of the drawings. The lower radiator, P, is extended around the rear portion of the combustion-chamber and terminates in front thereof at opposite sides of the feed-door E, as illustrated in Fig. 4 of the drawings, and communicates at, its ends with the upper radiator, P, by pipes at a, rising from the former to the latter. Each of said radiators is provided at its ends with cleaningflues c c, which extend through the casing D,

and are provided at their outer ends with removable covers (1 d, said flues affording convenient access to the interior of the radiators for a broom or scraper to remove the dust and soot therefrom.

F denotes the direct exit-flue connected to the upper part of the combustion-chamber at the rear, and F is an exit-flue extended from the lower radiator, p, to the direct flue F. A damper, c, is connected with the direct flue between the combustion-chamber and intersection of the flue F, and by closing said damper the products of combustion are compelled to assume the circuitous passage from the top of the combustion-chamberto the ends of the upper radiator, P, thence forward in said radiator at opposite sides of the combustion-chamber. and down through the pipes a a to the ends of the lower radiator, P, thence back toward the rear of the combustion-chamber at opposite sides thereof, and out through the exit-flue F. In said circuitous passage of the products of combustion the radiators are thoroughly heated, and the heat is absorbed therefrom by the air rising from the bottom of the casing D and circulating through the passages b baround the exterior of the radiators, and thence on to the apartments to be heated.

It will be observed that the course of the products of combustion is not only circuitous, but also partly downward, thereby retarding the escape of the productsof combustion and insuring the retention of the heat in the radiators.

I designatesthe dust-pipe,which leads from the ash-pit A,and has hitherto been extended either to the exit-flue or to the combustionchamber to convey thereto the dust ereatedin the ash'pit during the operation of shaking the grate, I now extend said dust-pipe into one of the radiators, preferably the lower radiator, P, from which thednst can be removed through the cleaning-flue c, hereinbefore referred to. Said dust-pipe is provided with the usual damper by which to close said pipe after the ashes have escaped from the ash'pit through the pipe.

Having described my invention, what I claim is- I 1. The combination, with the fire-pot and combustion-chamber, of segmental radiators extending around the exterior of the combus- (ion-chamber and terminating at opposite sides of the latter, one of said radiators communicating at its ends with the combustion-chamber, and the other radiator communicating at its ends with the first radiator, and an exitflue connected with the last radiator, substantially as set forth.

2. The combination, with the fire-pot and combustion -chamber, of two radiators surrounding the combustion-chamber, one of said radiators communicating with the combustionchamber at one side of the circumference thereof, the other radiator communicating with the first radiator at the opposite side of the circumference of the combustion-chamber, a direct exit-flue extended from the combustionchamber, an indirect exit-fine extended from the second radiator to the direct exit-flue, and

a damper in one of said exit-flues, substantially as set forth and shown.

3. In combination with the combustionchamber and inclosing-casing, two radiators arranged one above the other and surrounding the combustion-chamber, one of said radiators extending aroundthe front of the combustionchamber and communicating with the same at the rear, and the other radiator extending around the rear of the combustion-chamber and communicating with the first of said radiators at the front and provided with an exitfiue at the rear, substantially as described and shown.

4. I11 combination with the combustionchamber 0 and easing D, the pipe P, extending around the front portion of the combustionchamber and terminating at the rear of said chamber, and provided thereat with the pipes at a, extending to the upper part of the combustion-chamber, the pipe P, arranged below the pipe P, and extending around the rear portion of the combust ion-chamber, pipes a a,

connecting the pipe P with the pipe P at the front of the combustion chamber, cleaningflues 00, extending from the ends of the pipes P P through the casing outward, and the exitflue F, connected to the rear portion of the pipe P,all combined substantially as described and shown.

In testimony whereof I have hereunto signed my name andaffixed my seal, in the presence of two attesting witnesses, at Syracuse, in the county of Onondaga, in the State ofNcw York, this 11th day of November, 1885.

JOHN F. PEASE. [L s] Witnesses:

G. H. DUELL, FREDERICK H. GIBBS. 

